请教一道方差计算题－22%－17.4%)^2×0.1+(－2%－17.4%)^2×0.2+(20%－17.4%)^2×0.4+(3_数学解答

请教一道方差计算题
－22%－17.4%)^2×0.1+(－2%－17.4%)^2×0.2+(20%－17.4%)^2×0.4+(35%－17.4%)^2×0.2+(50%－17.4%)^2×0.1＝多少,麻烦列出计算过程,

人气：289 ℃　时间：2020-06-12 13:03:04

解答

－22%－17.4%)^2×0.1+(－2%－17.4%)^2×0.2+(20%－17.4%)^2×0.4+(35%－17.4%)^2×0.2+(50%－17.4%)^2×0.1
=(-39.4%)^2×0.1+(-19.4%)^2×0.2+2.6%^2×0.4+17.6%^2×0.2+32.6%^2×0.1
=0.0155236+0.0075272+0.0002704+0.0061952+0.0106276
=0.040144